mpsutil: Fix data truncation by too short buffers.

Length of some string buffers was insufficient for cases of more that
99 targets per HBA or slots per enclosure. Some others are tuned just
for better alignment. While there also fix output formatting issues.

MFC after: 1 week
Sponsored by: iXsystems, Inc.

(cherry picked from commit f5b0083302edcf421265530cc01dd87c06b23af1)